Cross-jointed iron bars.



' no, 746,230. PATENTED DEC. 8, 1903.

' 7K. ZUGKER.

.caogs JOINTED IRON BARS.

APPLICATION FILED MAR, 31. 1 903. 7

H0 MODEL.

. 1%" .2.- .Fiy. 1. y

UNITED STATES Patented December 8, 1903.

KARL ZUOKER, OF MANNHEIM, GERMANY.

CROSS-JOINTED IRON BARS.

SPECIFICATION forming part of Letters Patent N 0. 746,230, datedDecember 8, 1903.

h pplication filed llliarch 31, 1903- Serial No. 150,395. (No model.) I

"T0 at whomjt 19mg concern.-

Be it known that I, KARL ZUCKER, a subject of the Grand Duke ofBademresiding at Mannheim, in the Grand Duchy of Baden,

' German Empire, have invented certain new piece is subsequentlyhammered into a recess.

in the inserted bar.

According to prior methods of uniting crosswise iron bars of equalsection the web is completely out through, which has the seriousdisadvantage of greatly diminishing the strength. In inserting asmallerbar through a larger one this defect is avoided; but otherinconveniences arise, in particular the impossibility of fittingcasements and the difficulty of fixing glass panes, owing to thediffering height of the bar to which the putty is applied. Thesedisadvantages are overcome by means of my invention, which relates tocross-jointed iron bars of equal crosssection. bridged slot, and theslot being forced out and widened the second bar is pushed therethrough,whereupon the bridge portion of the web is hammered down intoa recess inthe inserted bar. The forcing out and widening of the slotthat is, thepressing or driving up of the strip remaining above the sl0tcan be donein the cold state, so that the ham- 'mering down of this portion of theweb into the recess of the inserted bar is facilitated.-

The accompanying drawings illustrate one form of the cross-jointed ironbars according to my invention.

One of the bars is provided with a up. Fig. 5 shows two bars connectedcrosswise with the bridge above the slot driven into a recess in theinserted bar. Fig. 6 is a section on the .line A A of Fig. 5.

One bar, 0;, of the two bars a b of equal cross-section is provided witha slot or aperture c, which is so enlarged that the other bar, I), canbeinserted through it. Laterally of this slot slits w are made. In thismanner the bridge 01 of the web of the slotted bar can be driven orpressed up without the application of heat, as has formerly beennecessary, and the so forced-up portion at can then subsequently be morereadily driven down into the recess in the inserted bar, as shown inFigs. 5 and 6. It willbe understood that the bars may have othercross-section thanthe one illustrated.

What I claim as my invention, and desire to secure by Letters Patent, is

Gross-jointed iron bars of equal c ross-section, consisting of a bartheweb of which has a bridged aperture with lateral slits, and a second barinserted through the said. aperture and having a recess in itsweb whichreceives the said bridge, essentially as set forth.

In testimony whereof I have signed my name to this specification in thepresenceof two subscribing witnesses.

KARL ZUOKER.

Witnesses:

JACOB ADRIAN, H. W. HARRIS.

